What does uv mean?

UV (ultraviolet ray) refers to ultraviolet rays, which are divided into four types: vacuum, short wave, medium wave, long wave and ultra-long wave. Ultraviolet refers to the wavelength in the electromagnetic spectrum from 10 nm to 400 nm? The floorboard of radiation, people can't see it.

180 1 year, German physicist Ritter discovered that the outer section of the ultraviolet end of the solar spectrum can make the photographic film containing silver bromide sensitive, thus discovering the existence of ultraviolet rays. Ultraviolet rays can be used for sterilization, and too much ultraviolet rays can lead to skin cancer.

Ultraviolet surface sterilization devices are widely used in food, electronics, semiconductors, liquid crystal displays, plasma televisions, crystal oscillators, precision devices, chemical industry, medicine, health care, biology, beverages, agriculture and other fields. Ultraviolet light source irradiates the surface of food and materials, which has a rapid, efficient and pollution-free sterilization effect, thus maintaining the high quality of your products.

Extended data

Australian researchers have recently developed a new type of ink, which can change color according to the intensity of ultraviolet rays. It can be printed on any paper surface and made into a wearable sensor, providing portable and personalized sunshine reminder service for people with different skin colors.

Sunlight can keep vitamin D in the human body at a healthy level, thus promoting the absorption of calcium, but too much sunlight will increase the risk of skin cancer, blindness or skin aging. Research shows that people with different skin colors need different amounts of healthy sunshine, and the darker the skin color, the greater the amount of healthy sunshine.

For example, pale skin with the lightest skin color can only tolerate one-fifth of the sunlight of the deepest skin, otherwise the risk of related diseases will increase.

Professor Viple Binsard, who led the invention at the Royal Melbourne Institute of Technology, said that the ink they invented can change color after sunlight, and can be printed on the surface of paper to make sensors in the form of bracelets, headband or stickers.

The display area on the sensor surface will be marked according to different sunshine. When the sunshine reaches a certain amount, the ink will be displayed in the corresponding area, so that users can know the body's acceptance of sunshine in real time.

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